Ah, the RA grille mod, simplest thing and one of the best looking. On your car it will look even better. I've seen a few black scoobs with the RA grille and it is tight.
Anyway, head over to AutoZone and pick up some 1/4" red pin stripping. Then all you have to do is take your time. Here is what got me started http://forums.nasioc.com/forums/showthread.php?t=1229738. I forgot to vote on your page, I'll do that now.
-AJ

Nice scoob, I'd like to invite you to join ClubWRX via http://groups.cardomain.com/groups/12950/pages/13384. Join the CarDomain group then join the club. It's free. Oh and check out my ride when you can.